Unusual dry sliding tribological behavior of biomedical ultrafine-grained TiNbZrTaFe composites fabricated by powder met
- PDF / 837,443 Bytes
- 8 Pages / 584.957 x 782.986 pts Page_size
- 2 Downloads / 187 Views
u Zhou, Chao Yang,a) Shenguan Qu, and Yuanyuan Li National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, People’s Republic of China (Received 24 October 2013; accepted 25 February 2014)
Tribological behavior of biomedical ultrafine-grained (UFGed) TiNbZrTaFe (TNZTF) composites fabricated by powder metallurgy was investigated under dry wear condition. Results show that compared with two kinds of conventional biomedical Ti–6Al–4V (TAV) and Ti–13Nb–13Zr (TNZ) alloys, the wear loss of the TNZTF samples is only 3.5% and 1% of that of the TAV and TNZ samples, respectively. Unusual tribological behavior is that the wear loss of the TNZTF samples decreases with the increase in sliding speed at the same load. This is attributed to the formation of a large amount of hard Nb2O5 particles on the contact surface of the material during rubbing and more severe plastic deformation in the material layers adjacent to the contact surfaces. The wear mechanism of the three kinds of alloys was also investigated. The outstanding tribological property proves that the UFGed TNZTF alloys should be an excellent candidate material to be used for biomedical application in the future.
I. INTRODUCTION
Because of the excellent combination of mechanical property and biocompatibility, titanium alloys are widely used as implant materials for orthopedic applications.1–3 Among these orthopedic titanium alloys, Ti–6Al–4V (TAV) with a 1 b microstructure is one of the widely used implant materials to date. However, TAV has several disadvantages such as the toxicity of Al and V, low strength, high elastic modulus relative to human bone, and poor wear resistance.4 Recently, some near-b type titanium alloys including Nb, Zr, and Ta elements, for example Ti–13Nb–13Zr (TNZ), have been prepared by melt solidification.5 These near-b type alloys possess excellent combination of high strength, low elastic modulus, enhanced corrosion resistance, and superior biocompatibility compared with conventional a 1 b type alloys. Nevertheless, it was found that due to low resistance to plastic shearing and low work hardening of Ti alloys, these near-b type alloys also suffer from the shortcoming of poor tribological property.6,7 It is well known that low wear resistance of implant materials results in implant failure because wear debris can be released into the surrounding tissue. This can a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2014.58 902
J. Mater. Res., Vol. 29, No. 7, Apr 14, 2014
http://journals.cambridge.org
Downloaded: 01 Apr 2015
restrict bone resorption and lead to loosening of implants,1,8 and consequently cause an adverse cellular response leading to inflammation and pain in the body. To avoid this phenomenon, many methods including surface modification and heat treatment9 were used to increase wear resistance of titanium alloy implants. More recently, a biomedical ultrafine-grained (UFGed) Ti65.5Nb22.3Zr4.6Ta1.6Fe6 (TNZTF) com
Data Loading...
